feat(protocol): simplify protocol and remove prover pool from core protocol

[dantaik]

Inspired by Brecht's feature request, this PR aims to separate the current prover (pool) contract from the core protocol, allowing various prover contract designs. Taiko will act as the "glue" between the core protocol and different prover contracts.

Changes introduced in this PR:

• Block Proposal: Blocks must assign a non-zero prover address, and proposers will pay a non-refundable Ether fee to the prover. The prover will burn Taiko tokens as a bond, returned if proof is submitted within 90 minutes; otherwise, the block opens, and half the bond goes to the actual prover.
• Prover Authorization: If an EOA, must authorize the proposer with a valid ECDSA signature; if a contract, must have a onBlockAssigned function that doesn't revert.
• Notification Calls: Removed on-chain notification calls to prover (pool) contract to prevent malicious exploitation.
• Prover (Pool) Contract and API: Deleted IProverPool. Taiko and partners will create a Pool API server for proposers to access proving services.
• Token and Configuration: Taiko token decimals is set to 18. TaikoConfig is simplified, loaded from a Library for testing.

Taiko Token functions as a bond token for provers.

• @davidtaikocha @smtmfft I added two TODOs for you in this PR.

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Name	Status	Preview	Comments	Updated (UTC)
bridge-ui-v2	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 26, 2023 3:58am

[joohhnnn]

Perhaps it would be more appropriate to replace the public keyword with external? Can slightly reduce some gas